Beetle Lynx (Mednafen Lynx)

Beetle Lynx (Mednafen Lynx) emulates Atari Lynx. It reads 1 file, 1 of them required: without a required file it does not start games.

About this profile

Detail	Value
Type	libretro
Classification	Community fork
Source	https://github.com/libretro/beetle-lynx-libretro
Upstream	https://mednafen.github.io/
Version	v1.24.0, stated in libretro.cpp
Revision	libretro/beetle-lynx-libretro@fcdefcfb3c11
Profiled	2026-03-24
Profile	YAML, JSON
Cores	mednafen_lynx, beetle-lynx
Systems	Atari Lynx
Checks the file by	existence

Install this emulator's files

The installer finds your setup and its BIOS folder, then downloads only the files this emulator reads there and checks each one.

Windows

Open the Start menu. Type PowerShell and open it. Paste the line. Press Enter.

PowerShell

&([scriptblock]::Create((irm https://abdess.github.io/retrobios/i.ps1))) --emulator beetle_lynx

macOS

Open Terminal, in Applications, then Utilities. Paste the line. Press Return.

Terminal

curl -fsSL https://abdess.github.io/retrobios/i | sh -s -- --emulator beetle_lynx

Linux

Open a terminal. Paste the line. Press Enter.

Terminal

curl -fsSL https://abdess.github.io/retrobios/i | sh -s -- --emulator beetle_lynx

Steam Deck

Switch to Desktop Mode. Open Konsole. Paste with Ctrl+Shift+V. Press Enter.

Terminal

curl -fsSL https://abdess.github.io/retrobios/i | sh -s -- --emulator beetle_lynx

Android (Termux)

Install Termux, a terminal app. Run pkg install python and termux-setup-storage once. Then paste the line. Press Enter.

Terminal

curl -fsSL https://abdess.github.io/retrobios/i | sh -s -- --emulator beetle_lynx

On the device

Open a terminal on the device. Or connect from a computer with SSH, a terminal over the network. Paste the line. Press Enter.

Terminal

curl -fsSL https://abdess.github.io/retrobios/i | sh -s -- --emulator beetle_lynx

Technical notes

Community fork of Mednafen's Lynx module (itself based on Handy by K. Wilkins) for libretro. Loads lynxboot.img from the system directory at game load time (libretro.cpp:191). CRom constructor reads exactly 512 bytes (rom.cpp:50-78). If the file is missing or undersized, the ROM array is filled with 0x88 (DEFAULT_ROM_CONTENTS) and the core continues without error, but games will not boot without the real boot ROM. No hash validation is performed on the BIOS at load time. The cart database in cart.cpp includes the BIOS CRC32 0x0d973c9d for identification purposes, not validation. Upstream Mednafen throws an exception if the BIOS is missing or undersized, while the libretro port silently degrades. Upstream supports custom palette loading (lynx.pal), but the libretro port does not.

Files

1 file: 1 required, 0 optional.

In this collection: 1 in repo and 0 missing.

Required

lynxboot.img required in repo Region: every region

Atari Lynx boot ROM

• 512-byte boot ROM. Core silently degrades without it but games will not run.

• Size: min 512 B, CRC32 0d973c9d
• Collection copy: bios/Atari/Lynx/Atari_LYNX_boot.img
• Platforms: lynxboot.img: Batocera, KNULLI, Lakka, RetroArch, RetroBat, RetroPie. bios/lynxboot.img: AmberELEC, EmuELEC, RetroDECK. lynx/lynxboot.img: Recalbox, RomM. AtariLynx/boot.rom: MiSTer FPGA. Atari_LYNX_boot.img: BizHawk

Hashes, validation and source

• CRC32: 0d973c9d
• Validation: size
• Source: libretro.cpp:191, mednafen/lynx/rom.cpp:50-78, mednafen/lynx/cart.cpp:67

Next steps

• Get your files, for the setup you play on
• Every system, and the files each one needs
• When a game does not start

Data as of 4 November 2026.